Definitions of diameter

  1. the length of a straight line passing through the center of a circle and connecting two points on the circumference
  2. Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve.
  3. A diametral plane.
  4. The length of a straight line through the center of an object from side to side; width; thickness; as, the diameter of a tree or rock.
  5. The distance through the lower part of the shaft of a column, used as a standard measure for all parts of the order. See Module.
  6. A straight line through the center of a figure, dividing it in half; as, the diameter of the earth is 7, 926 miles.
  7. The measure through or across: a straight line passing through the centre of a circle or other figure, terminated at both ends by the circumference.
  8. Straight line passing through the centre of a circle and terminated at both ends by the circumference; distance through the centre.
  9. A line through the center, as of a circle or sphere, terminated at the boundary thereof; the length of such a line.
  10. A straight line passing through the centre of a circle from circumference to circumference, and dividing it into two equal parts; the length of a right line passing through the centre of an object, from one side to the other.
  11. The measure of a body through from side to side; a straight line passing through the centre of a circle, having both ends terminated by the circumference.
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